Hard tissues are irradiated with combined beam of Er:YAG and Ho:YAG lasers to achieve highly
efficient ablation with lower laser power. We controlled the delay time between pulses of the two lasers and
irradiated alumina ceramic balls that are used as hard tissue samples. By optimizing the delay time, the combined
laser beam provides 40% higher perforation depth compared with the result with independent radiation of
Er:YAG or Ho:YAG laser. The ablation mechanism are observed and investigated by using an ultra-high-speed
camera and infrared thermography camera.
Laser ablation experiments on hard tissues are performed by guiding combined beam of Ho:YAG and
Er:YAG laser light with a hollow optical fiber. An alumina ball is used as a hard-tissue model and ablation
phenomenon are observed by an ultra-high-speed camera. The result show that the two laser light give dissimilar
ablation effects due to different absorption coefficients in water contained in the tissues. When the two lasers are
combined and irradiate on the model, a high ablation rate is observed.